2 * linux/fs/9p/trans_fd.c
4 * Fd transport layer. Includes deprecated socket layer.
6 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
7 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
8 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
9 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2
13 * as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to:
22 * Free Software Foundation
23 * 51 Franklin Street, Fifth Floor
24 * Boston, MA 02111-1301 USA
29 #include <linux/module.h>
30 #include <linux/net.h>
31 #include <linux/ipv6.h>
32 #include <linux/kthread.h>
33 #include <linux/errno.h>
34 #include <linux/kernel.h>
36 #include <linux/uaccess.h>
37 #include <linux/inet.h>
38 #include <linux/idr.h>
39 #include <linux/file.h>
40 #include <linux/parser.h>
41 #include <net/9p/9p.h>
42 #include <net/9p/client.h>
43 #include <net/9p/transport.h>
46 #define MAX_SOCK_BUF (64*1024)
48 #define MAXPOLLWADDR 2
51 * struct p9_fd_opts - per-transport options
52 * @rfd: file descriptor for reading (trans=fd)
53 * @wfd: file descriptor for writing (trans=fd)
54 * @port: port to connect to (trans=tcp)
65 * struct p9_trans_fd - transport state
66 * @rd: reference to file to read from
67 * @wr: reference of file to write to
68 * @conn: connection state reference
79 * Option Parsing (code inspired by NFS code)
80 * - a little lazy - parse all fd-transport options
84 /* Options that take integer arguments */
85 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
88 static const match_table_t tokens = {
89 {Opt_port, "port=%u"},
90 {Opt_rfdno, "rfdno=%u"},
91 {Opt_wfdno, "wfdno=%u"},
96 Rworksched = 1, /* read work scheduled or running */
97 Rpending = 2, /* can read */
98 Wworksched = 4, /* write work scheduled or running */
99 Wpending = 8, /* can write */
109 * struct p9_req - fd mux encoding of an rpc transaction
110 * @lock: protects req_list
111 * @tag: numeric tag for rpc transaction
112 * @tcall: request &p9_fcall structure
113 * @rcall: response &p9_fcall structure
115 * @flush: flag to indicate RPC has been flushed
116 * @req_list: list link for higher level objects to chain requests
117 * @m: connection this request was issued on
118 * @wqueue: wait queue that client is blocked on for this rpc
125 struct p9_fcall *tcall;
126 struct p9_fcall *rcall;
129 struct list_head req_list;
131 wait_queue_head_t wqueue;
134 struct p9_poll_wait {
135 struct p9_conn *conn;
137 wait_queue_head_t *wait_addr;
141 * struct p9_conn - fd mux connection state information
142 * @lock: protects mux_list (?)
143 * @mux_list: list link for mux to manage multiple connections (?)
144 * @client: reference to client instance for this connection
145 * @tagpool: id accounting for transactions
147 * @req_list: accounting for requests which have been sent
148 * @unsent_req_list: accounting for requests that haven't been sent
149 * @rcall: current response &p9_fcall structure
150 * @rpos: read position in current frame
151 * @rbuf: current read buffer
152 * @wpos: write position for current frame
153 * @wsize: amount of data to write for current frame
154 * @wbuf: current write buffer
155 * @poll_wait: array of wait_q's for various worker threads
158 * @rq: current read work
159 * @wq: current write work
165 spinlock_t lock; /* protect lock structure */
166 struct list_head mux_list;
167 struct p9_client *client;
168 struct p9_idpool *tagpool;
170 struct list_head req_list;
171 struct list_head unsent_req_list;
172 struct p9_fcall *rcall;
178 struct list_head poll_pending_link;
179 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
181 struct work_struct rq;
182 struct work_struct wq;
183 unsigned long wsched;
186 static DEFINE_SPINLOCK(p9_poll_lock);
187 static LIST_HEAD(p9_poll_pending_list);
188 static struct workqueue_struct *p9_mux_wq;
189 static struct task_struct *p9_poll_task;
191 static u16 p9_mux_get_tag(struct p9_conn *m)
195 tag = p9_idpool_get(m->tagpool);
202 static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
204 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
205 p9_idpool_put(tag, m->tagpool);
208 static void p9_mux_poll_stop(struct p9_conn *m)
213 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
214 struct p9_poll_wait *pwait = &m->poll_wait[i];
216 if (pwait->wait_addr) {
217 remove_wait_queue(pwait->wait_addr, &pwait->wait);
218 pwait->wait_addr = NULL;
222 spin_lock_irqsave(&p9_poll_lock, flags);
223 list_del_init(&m->poll_pending_link);
224 spin_unlock_irqrestore(&p9_poll_lock, flags);
227 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
229 p9_mux_put_tag(m, req->tag);
233 static void p9_conn_rpc_cb(struct p9_req *req);
235 static void p9_mux_flush_cb(struct p9_req *freq)
238 struct p9_conn *m = freq->m;
239 struct p9_req *req, *rreq, *rptr;
241 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
242 freq->tcall, freq->rcall, freq->err,
243 freq->tcall->params.tflush.oldtag);
246 tag = freq->tcall->params.tflush.oldtag;
248 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
249 if (rreq->tag == tag) {
251 list_del(&req->req_list);
255 spin_unlock(&m->lock);
258 spin_lock(&req->lock);
259 req->flush = Flushed;
260 spin_unlock(&req->lock);
267 p9_mux_free_request(m, freq);
270 static void p9_conn_rpc_cb(struct p9_req *req)
272 P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req);
274 if (req->tcall->id == P9_TFLUSH) { /* flush callback */
275 P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req);
276 p9_mux_flush_cb(req);
277 } else { /* normal wakeup path */
278 P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req);
279 if (req->flush != None && !req->err)
280 req->err = -ERESTARTSYS;
282 wake_up(&req->wqueue);
287 * p9_conn_cancel - cancel all pending requests with error
293 void p9_conn_cancel(struct p9_conn *m, int err)
295 struct p9_req *req, *rtmp;
296 LIST_HEAD(cancel_list);
298 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
301 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
302 list_move(&req->req_list, &cancel_list);
304 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
305 list_move(&req->req_list, &cancel_list);
307 spin_unlock(&m->lock);
309 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
310 list_del(&req->req_list);
318 static void process_request(struct p9_conn *m, struct p9_req *req)
321 struct p9_str *ename;
323 if (!req->err && req->rcall->id == P9_RERROR) {
324 ecode = req->rcall->params.rerror.errno;
325 ename = &req->rcall->params.rerror.error;
327 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
334 req->err = p9_errstr2errno(ename->str, ename->len);
336 /* string match failed */
338 PRINT_FCALL_ERROR("unknown error", req->rcall);
339 req->err = -ESERVERFAULT;
342 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
343 P9_DPRINTK(P9_DEBUG_ERROR,
344 "fcall mismatch: expected %d, got %d\n",
345 req->tcall->id + 1, req->rcall->id);
352 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
355 struct p9_trans_fd *ts = NULL;
357 if (client && client->status == Connected)
363 if (!ts->rd->f_op || !ts->rd->f_op->poll)
366 if (!ts->wr->f_op || !ts->wr->f_op->poll)
369 ret = ts->rd->f_op->poll(ts->rd, pt);
373 if (ts->rd != ts->wr) {
374 n = ts->wr->f_op->poll(ts->wr, pt);
377 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
384 * p9_fd_read- read from a fd
385 * @client: client instance
386 * @v: buffer to receive data into
387 * @len: size of receive buffer
391 static int p9_fd_read(struct p9_client *client, void *v, int len)
394 struct p9_trans_fd *ts = NULL;
396 if (client && client->status != Disconnected)
402 if (!(ts->rd->f_flags & O_NONBLOCK))
403 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
405 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
406 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
407 client->status = Disconnected;
412 * p9_read_work - called when there is some data to be read from a transport
413 * @work: container of work to be done
417 static void p9_read_work(struct work_struct *work)
421 struct p9_req *req, *rptr, *rreq;
422 struct p9_fcall *rcall;
425 m = container_of(work, struct p9_conn, rq);
431 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
435 kmalloc(sizeof(struct p9_fcall) + m->client->msize,
442 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
446 clear_bit(Rpending, &m->wsched);
447 err = p9_fd_read(m->client, m->rbuf + m->rpos,
448 m->client->msize - m->rpos);
449 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
450 if (err == -EAGAIN) {
451 clear_bit(Rworksched, &m->wsched);
459 while (m->rpos > 4) {
460 n = le32_to_cpu(*(__le32 *) m->rbuf);
461 if (n >= m->client->msize) {
462 P9_DPRINTK(P9_DEBUG_ERROR,
463 "requested packet size too big: %d\n", n);
472 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
476 #ifdef CONFIG_NET_9P_DEBUG
477 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
480 p9_printfcall(buf, sizeof(buf), m->rcall,
482 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
489 m->rcall = kmalloc(sizeof(struct p9_fcall) +
490 m->client->msize, GFP_KERNEL);
496 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
497 memmove(m->rbuf, rbuf + n, m->rpos - n);
505 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
506 rcall->id, rcall->tag);
510 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
511 if (rreq->tag == rcall->tag) {
513 if (req->flush != Flushing)
514 list_del(&req->req_list);
518 spin_unlock(&m->lock);
522 process_request(m, req);
524 if (req->flush != Flushing)
527 if (err >= 0 && rcall->id != P9_RFLUSH)
528 P9_DPRINTK(P9_DEBUG_ERROR,
529 "unexpected response mux %p id %d tag %d\n",
530 m, rcall->id, rcall->tag);
535 if (!list_empty(&m->req_list)) {
536 if (test_and_clear_bit(Rpending, &m->wsched))
539 n = p9_fd_poll(m->client, NULL);
542 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
543 queue_work(p9_mux_wq, &m->rq);
545 clear_bit(Rworksched, &m->wsched);
547 clear_bit(Rworksched, &m->wsched);
552 p9_conn_cancel(m, err);
553 clear_bit(Rworksched, &m->wsched);
557 * p9_fd_write - write to a socket
558 * @client: client instance
559 * @v: buffer to send data from
560 * @len: size of send buffer
564 static int p9_fd_write(struct p9_client *client, void *v, int len)
568 struct p9_trans_fd *ts = NULL;
570 if (client && client->status != Disconnected)
576 if (!(ts->wr->f_flags & O_NONBLOCK))
577 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
581 /* The cast to a user pointer is valid due to the set_fs() */
582 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
585 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
586 client->status = Disconnected;
591 * p9_write_work - called when a transport can send some data
592 * @work: container for work to be done
596 static void p9_write_work(struct work_struct *work)
602 m = container_of(work, struct p9_conn, wq);
605 clear_bit(Wworksched, &m->wsched);
610 if (list_empty(&m->unsent_req_list)) {
611 clear_bit(Wworksched, &m->wsched);
617 req = list_entry(m->unsent_req_list.next, struct p9_req,
619 list_move_tail(&req->req_list, &m->req_list);
620 if (req->err == ERREQFLUSH)
623 m->wbuf = req->tcall->sdata;
624 m->wsize = req->tcall->size;
626 spin_unlock(&m->lock);
629 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
631 clear_bit(Wpending, &m->wsched);
632 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
633 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
634 if (err == -EAGAIN) {
635 clear_bit(Wworksched, &m->wsched);
647 if (m->wpos == m->wsize)
648 m->wpos = m->wsize = 0;
650 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
651 if (test_and_clear_bit(Wpending, &m->wsched))
654 n = p9_fd_poll(m->client, NULL);
657 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
658 queue_work(p9_mux_wq, &m->wq);
660 clear_bit(Wworksched, &m->wsched);
662 clear_bit(Wworksched, &m->wsched);
667 p9_conn_cancel(m, err);
668 clear_bit(Wworksched, &m->wsched);
671 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
673 struct p9_poll_wait *pwait =
674 container_of(wait, struct p9_poll_wait, wait);
675 struct p9_conn *m = pwait->conn;
677 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
679 spin_lock_irqsave(&p9_poll_lock, flags);
680 if (list_empty(&m->poll_pending_link))
681 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
682 spin_unlock_irqrestore(&p9_poll_lock, flags);
684 /* perform the default wake up operation */
685 return default_wake_function(&dummy_wait, mode, sync, key);
689 * p9_pollwait - add poll task to the wait queue
690 * @filp: file pointer being polled
691 * @wait_address: wait_q to block on
694 * called by files poll operation to add v9fs-poll task to files wait queue
698 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
700 struct p9_conn *m = container_of(p, struct p9_conn, pt);
701 struct p9_poll_wait *pwait = NULL;
704 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
705 if (m->poll_wait[i].wait_addr == NULL) {
706 pwait = &m->poll_wait[i];
712 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
717 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
718 pwait->wait_addr = ERR_PTR(-EIO);
723 pwait->wait_addr = wait_address;
724 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
725 add_wait_queue(wait_address, &pwait->wait);
729 * p9_conn_create - allocate and initialize the per-session mux data
730 * @client: client instance
732 * Note: Creates the polling task if this is the first session.
735 static struct p9_conn *p9_conn_create(struct p9_client *client)
740 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
741 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
743 return ERR_PTR(-ENOMEM);
745 spin_lock_init(&m->lock);
746 INIT_LIST_HEAD(&m->mux_list);
748 m->tagpool = p9_idpool_create();
749 if (IS_ERR(m->tagpool)) {
751 return ERR_PTR(-ENOMEM);
754 INIT_LIST_HEAD(&m->req_list);
755 INIT_LIST_HEAD(&m->unsent_req_list);
756 INIT_WORK(&m->rq, p9_read_work);
757 INIT_WORK(&m->wq, p9_write_work);
758 INIT_LIST_HEAD(&m->poll_pending_link);
759 init_poll_funcptr(&m->pt, p9_pollwait);
761 n = p9_fd_poll(client, &m->pt);
763 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
764 set_bit(Rpending, &m->wsched);
768 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
769 set_bit(Wpending, &m->wsched);
772 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
773 if (IS_ERR(m->poll_wait[i].wait_addr)) {
776 /* return the error code */
777 return (void *)m->poll_wait[i].wait_addr;
785 * p9_poll_mux - polls a mux and schedules read or write works if necessary
786 * @m: connection to poll
790 static void p9_poll_mux(struct p9_conn *m)
797 n = p9_fd_poll(m->client, NULL);
798 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
799 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
802 p9_conn_cancel(m, n);
806 set_bit(Rpending, &m->wsched);
807 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
808 if (!test_and_set_bit(Rworksched, &m->wsched)) {
809 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
810 queue_work(p9_mux_wq, &m->rq);
815 set_bit(Wpending, &m->wsched);
816 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
817 if ((m->wsize || !list_empty(&m->unsent_req_list))
818 && !test_and_set_bit(Wworksched, &m->wsched)) {
819 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
820 queue_work(p9_mux_wq, &m->wq);
826 * p9_send_request - send 9P request
827 * The function can sleep until the request is scheduled for sending.
828 * The function can be interrupted. Return from the function is not
829 * a guarantee that the request is sent successfully. Can return errors
830 * that can be retrieved by PTR_ERR macros.
833 * @tc: request to be sent
837 static struct p9_req *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
842 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
845 return ERR_PTR(m->err);
847 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
849 return ERR_PTR(-ENOMEM);
851 if (tc->id == P9_TVERSION)
854 n = p9_mux_get_tag(m);
858 return ERR_PTR(-ENOMEM);
863 #ifdef CONFIG_NET_9P_DEBUG
864 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
867 p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
868 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
872 spin_lock_init(&req->lock);
874 init_waitqueue_head(&req->wqueue);
882 list_add_tail(&req->req_list, &m->unsent_req_list);
883 spin_unlock(&m->lock);
885 if (test_and_clear_bit(Wpending, &m->wsched))
888 n = p9_fd_poll(m->client, NULL);
890 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
891 queue_work(p9_mux_wq, &m->wq);
897 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
900 struct p9_req *rreq, *rptr;
902 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
904 /* if a response was received for a request, do nothing */
905 spin_lock(&req->lock);
906 if (req->rcall || req->err) {
907 spin_unlock(&req->lock);
908 P9_DPRINTK(P9_DEBUG_MUX,
909 "mux %p req %p response already received\n", m, req);
913 req->flush = Flushing;
914 spin_unlock(&req->lock);
917 /* if the request is not sent yet, just remove it from the list */
918 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
919 if (rreq->tag == req->tag) {
920 P9_DPRINTK(P9_DEBUG_MUX,
921 "mux %p req %p request is not sent yet\n", m, req);
922 list_del(&rreq->req_list);
923 req->flush = Flushed;
924 spin_unlock(&m->lock);
929 spin_unlock(&m->lock);
931 clear_thread_flag(TIF_SIGPENDING);
932 fc = p9_create_tflush(req->tag);
933 p9_send_request(m, fc);
938 * p9_fd_rpc- sends 9P request and waits until a response is available.
939 * The function can be interrupted.
940 * @client: client instance
941 * @tc: request to be sent
942 * @rc: pointer where a pointer to the response is stored
947 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
949 struct p9_trans_fd *p = client->trans;
950 struct p9_conn *m = p->conn;
959 if (signal_pending(current)) {
961 clear_thread_flag(TIF_SIGPENDING);
964 req = p9_send_request(m, tc);
967 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
971 err = wait_event_interruptible(req->wqueue, req->rcall != NULL ||
976 if (err == -ERESTARTSYS && client->status == Connected
978 if (p9_mux_flush_request(m, req)) {
979 /* wait until we get response of the flush message */
981 clear_thread_flag(TIF_SIGPENDING);
982 err = wait_event_interruptible(req->wqueue,
983 req->rcall || req->err);
984 } while (!req->rcall && !req->err &&
985 err == -ERESTARTSYS &&
986 client->status == Connected && !m->err);
994 spin_lock_irqsave(¤t->sighand->siglock, flags);
996 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
1004 p9_mux_free_request(m, req);
1012 * parse_options - parse mount options into session structure
1013 * @options: options string passed from mount
1014 * @opts: transport-specific structure to parse options into
1016 * Returns 0 upon success, -ERRNO upon failure
1019 static int parse_opts(char *params, struct p9_fd_opts *opts)
1022 substring_t args[MAX_OPT_ARGS];
1027 opts->port = P9_PORT;
1034 options = kstrdup(params, GFP_KERNEL);
1036 P9_DPRINTK(P9_DEBUG_ERROR,
1037 "failed to allocate copy of option string\n");
1041 while ((p = strsep(&options, ",")) != NULL) {
1046 token = match_token(p, tokens, args);
1047 r = match_int(&args[0], &option);
1049 P9_DPRINTK(P9_DEBUG_ERROR,
1050 "integer field, but no integer?\n");
1056 opts->port = option;
1072 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
1074 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1081 if (!ts->rd || !ts->wr) {
1091 client->status = Connected;
1096 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1100 csocket->sk->sk_allocation = GFP_NOIO;
1101 fd = sock_map_fd(csocket, 0);
1103 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1107 ret = p9_fd_open(client, fd, fd);
1109 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1110 sockfd_put(csocket);
1114 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1120 * p9_mux_destroy - cancels all pending requests and frees mux resources
1121 * @m: mux to destroy
1125 static void p9_conn_destroy(struct p9_conn *m)
1127 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
1128 m->mux_list.prev, m->mux_list.next);
1130 p9_mux_poll_stop(m);
1131 cancel_work_sync(&m->rq);
1132 cancel_work_sync(&m->wq);
1134 p9_conn_cancel(m, -ECONNRESET);
1137 p9_idpool_destroy(m->tagpool);
1142 * p9_fd_close - shutdown file descriptor transport
1143 * @client: client instance
1147 static void p9_fd_close(struct p9_client *client)
1149 struct p9_trans_fd *ts;
1158 client->status = Disconnected;
1160 p9_conn_destroy(ts->conn);
1171 * stolen from NFS - maybe should be made a generic function?
1173 static inline int valid_ipaddr4(const char *buf)
1175 int rc, count, in[4];
1177 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1180 for (count = 0; count < 4; count++) {
1181 if (in[count] > 255)
1188 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1191 struct socket *csocket;
1192 struct sockaddr_in sin_server;
1193 struct p9_fd_opts opts;
1194 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1196 err = parse_opts(args, &opts);
1200 if (valid_ipaddr4(addr) < 0)
1205 sin_server.sin_family = AF_INET;
1206 sin_server.sin_addr.s_addr = in_aton(addr);
1207 sin_server.sin_port = htons(opts.port);
1208 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1211 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1216 err = csocket->ops->connect(csocket,
1217 (struct sockaddr *)&sin_server,
1218 sizeof(struct sockaddr_in), 0);
1220 P9_EPRINTK(KERN_ERR,
1221 "p9_trans_tcp: problem connecting socket to %s\n",
1226 err = p9_socket_open(client, csocket);
1230 p = (struct p9_trans_fd *) client->trans;
1231 p->conn = p9_conn_create(client);
1232 if (IS_ERR(p->conn)) {
1233 err = PTR_ERR(p->conn);
1242 sock_release(csocket);
1250 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1253 struct socket *csocket;
1254 struct sockaddr_un sun_server;
1255 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1259 if (strlen(addr) > UNIX_PATH_MAX) {
1260 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1262 err = -ENAMETOOLONG;
1266 sun_server.sun_family = PF_UNIX;
1267 strcpy(sun_server.sun_path, addr);
1268 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1269 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1270 sizeof(struct sockaddr_un) - 1, 0);
1272 P9_EPRINTK(KERN_ERR,
1273 "p9_trans_unix: problem connecting socket: %s: %d\n",
1278 err = p9_socket_open(client, csocket);
1282 p = (struct p9_trans_fd *) client->trans;
1283 p->conn = p9_conn_create(client);
1284 if (IS_ERR(p->conn)) {
1285 err = PTR_ERR(p->conn);
1294 sock_release(csocket);
1301 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1304 struct p9_fd_opts opts;
1305 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1307 parse_opts(args, &opts);
1309 if (opts.rfd == ~0 || opts.wfd == ~0) {
1310 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1311 return -ENOPROTOOPT;
1314 err = p9_fd_open(client, opts.rfd, opts.wfd);
1318 p = (struct p9_trans_fd *) client->trans;
1319 p->conn = p9_conn_create(client);
1320 if (IS_ERR(p->conn)) {
1321 err = PTR_ERR(p->conn);
1333 static struct p9_trans_module p9_tcp_trans = {
1335 .maxsize = MAX_SOCK_BUF,
1337 .create = p9_fd_create_tcp,
1338 .close = p9_fd_close,
1340 .owner = THIS_MODULE,
1343 static struct p9_trans_module p9_unix_trans = {
1345 .maxsize = MAX_SOCK_BUF,
1347 .create = p9_fd_create_unix,
1348 .close = p9_fd_close,
1350 .owner = THIS_MODULE,
1353 static struct p9_trans_module p9_fd_trans = {
1355 .maxsize = MAX_SOCK_BUF,
1357 .create = p9_fd_create,
1358 .close = p9_fd_close,
1360 .owner = THIS_MODULE,
1364 * p9_poll_proc - poll worker thread
1365 * @a: thread state and arguments
1367 * polls all v9fs transports for new events and queues the appropriate
1368 * work to the work queue
1372 static int p9_poll_proc(void *a)
1374 unsigned long flags;
1376 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1378 spin_lock_irqsave(&p9_poll_lock, flags);
1379 while (!list_empty(&p9_poll_pending_list)) {
1380 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1383 list_del_init(&conn->poll_pending_link);
1384 spin_unlock_irqrestore(&p9_poll_lock, flags);
1388 spin_lock_irqsave(&p9_poll_lock, flags);
1390 spin_unlock_irqrestore(&p9_poll_lock, flags);
1392 set_current_state(TASK_INTERRUPTIBLE);
1393 if (list_empty(&p9_poll_pending_list)) {
1394 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1397 __set_current_state(TASK_RUNNING);
1399 if (!kthread_should_stop())
1402 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1406 int p9_trans_fd_init(void)
1408 p9_mux_wq = create_workqueue("v9fs");
1410 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1414 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1415 if (IS_ERR(p9_poll_task)) {
1416 destroy_workqueue(p9_mux_wq);
1417 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1418 return PTR_ERR(p9_poll_task);
1421 v9fs_register_trans(&p9_tcp_trans);
1422 v9fs_register_trans(&p9_unix_trans);
1423 v9fs_register_trans(&p9_fd_trans);
1428 void p9_trans_fd_exit(void)
1430 kthread_stop(p9_poll_task);
1431 v9fs_unregister_trans(&p9_tcp_trans);
1432 v9fs_unregister_trans(&p9_unix_trans);
1433 v9fs_unregister_trans(&p9_fd_trans);
1435 destroy_workqueue(p9_mux_wq);